[Users] New setup - deploy OpenVZ or wait for VZ7?

[Sergey Bronnikov]

On 13:23 Mon 06 Jun , Volker Janzen wrote:
> Hi Sergey,
> 
> > On 14:39 Sun 05 Jun , Volker Janzen wrote:
> >>> 
> >>> Unfortunately no. We don't support upgrade from pre-release version to the final one.
> >> 
> >> When I use a CentOS 7 as base system and install VZ7 afterward it's not possible to upgrade, too?
> > 
> > There is only one supported configuration for new installations -
> > clean Virtuozzo 7 installation.
> 
> okay I see. My setup will be unsupported if installed on plain CentOS 7 either way.

I forgot to mention one important thing in my previous answer. As you know
Virtuozzo 7 based on VzLinux distribution. VzLinux is a Linux distribution similar
to CentOS but it is not the same. VzLinux is not just rebuilded RPM packages
from CentOS. Some RPM packages in VzLinux contains fixes or changes specific to
Virtuozzo which are absent in RHEL/CentOS.

Just for example:
- we don't use stock rsync, it includes implementation of additional option which makes
container live migration possible.
- vzprocps packages are stock ps/top utilities with our patches to support containers monitoring
- AFAIK we have patches in gparted package
and so on.
- Virtuozzo contains the package ext4defrag required to working with ploop images

If you have time to fight with troubles which may happen in Vz installed on top of CentOS
or any other RPM based Linux distribution - it is your choice.

Please understand me correctly, we don't want to support a variety of all Linux zoo.
It requires much more time of development, testing and support.

> >>>> It also seems to lack some documentation for my use cases, but I need to start
> >>>> with VZ7 sooner or later.
> >>> 
> >>> What usecases are you talking about?
> >> 
> >> My current OpenVZ setup has LVM involved.
> >> I want to be able to use simfs based storage on an underlaying LVM volume.
> > 
> > Why do you prefer simfs instead of ploop? Did you see comparison simfs vs ploop?
> > https://openvz.org/CT_storage_backends
> 
> I think you asked me about this some time ago. The matrix states: Reliability
> Low: big amount of files produce ext4 corruption so often
> 
> Why should I use something that tells me it's not reliable?
> 
> The /vz partition has also the big advantage of using LVM snapshots and it
> allows rsync of the container data to another host with less overhead.
> 
> Also the need to compress the ploop files does not seem to be something I'm willing to do.
> 
> 
> Regards
>    Volker
> 
> > 
> >> And I want to be able to setup KVM based VMs that have a LVM based disk, too.
> >> In best case KVM VMs can be created from a template, as with the container VMs.
> > 
> > Den, is it possible in Vz7?
> > 
> >> Regards
> >>   Volker